There aren’t many seats left for the concert; you had better make sure ________ two today.[ ]

The children ____ very quiet；I wonder what they ____ up to

The students in our class aren’t as _____ as those in yours. But they are _______.

You should try to get a good night sleep____ much workyou have to do

Prices of food in that area ____ sharply since word came that the war would break out soon